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Protesters pull out a Chinese national flag in front of a local government office in Zhejiang province's Ningbo city, protesting the proposed expansion of a petrochemical factory Sunday, Oct. 28, 2012. Several hundred citizens of Ningbo gathered outside the offices of the municipal government and shouted for the city's mayor to come out and for the release of people they believed had been detained by police during demonstrations Saturday. (AP Photo/Ng Han Guan)

Protesters pull out a Chinese national flag in front of a local government office in Zhejiang province's Ningbo city, protesting the proposed expansion of a petrochemical factory Sunday, Oct. 28, 2012. Several hundred citizens of Ningbo gathered outside the offices of the municipal government and shouted for the city's mayor to come out and for the release of people they believed had been detained by police during demonstrations Saturday. (AP Photo/Ng Han Guan)